Why both runtime-sized arrays and std::dynarray in C++14?

Question

Draft C++14 includes both runtime-sized arrays and the std::dynarray container. From what I can tell, the only real difference between the two is that st

Answer 1

I think you answered the question yourself, std::dynarray has the stl interface. A goal of c++11 and I'm assuming c++14 is to make c++ more user friendly, less error prone and easier for beginners. With c style arrays you may run into pointer arithmetic problems but dynarray avoids the problems if used as intended
EDIT: so it looks like one difference is that runtime-sized arrays must be allocated on the stack, increasing the likelyhood of a stack overflow. dynarray is allocated on the heap though it is possible to allocate on the stack (if the implementation did so)